Paleo et al. Nanoscale Research Letters 2011, 6:257 NANO EXPRESS Open Access Thermal, dielectrical and mechanical response of a and b-poly(vinilydene fluoride)/Co-MgO nanocomposites Antonio José Paleo1*, Carlos Martínez-Boubeta2, Lluís Balcells3, Carlos Miguel Costa4, Vitor Sencadas5 and Senentxu Lanceros-Mendez5 Abstract Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared. When the polymer is crystallized in the a-phase, the introduction of the nanoparticles leads to nucleation of the g-phase of PVDF, increasing also the melting temperature of the polymer. With the introduction of the Co-MgO particles, the dielectric constant of the material. | Paleo et al. Nanoscale Research Letters 2011 6 257 http content 6 1 257 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Thermal dielectrical and mechanical response of a and b-poly vinilydene fluoride Co-MgO nanocomposites Antrnnim Ir tco Dtỉ lor t 1 2rl c l l2rl ínc7-Rmi iHoTtỉ2 I II lie R lfollc3 f 3rla c Mim lol r mcf 24 ii o r Qor ir H c5 f ral Antonio Jose rdleo Callus Mdltlliez. Doubetd Lluis Ddlcells CdllUS Miguel Costd Vitor sencddds dlld Senentxu Ldncerus-Mendez5 Abstract Ndnocomposites of the self-forming core-shell Co-MgO ndnopdrticles which were of dpproximdtely 100 nm in didmeter dnd poly vinylidene fluoride PVDF polymer hdve been prepdred. When the polymer is crystdllized in the a-phdse the introduction of the ndnopdrticles ledds to nucledtion of the g-phdse of PVDF incredsing dlso the melting temperature of the polymer. With the introduction of the Co-MgO pdrticles the dielectric constdnt of the mdteridl slightly incredses dnd the stordge modulus decredses with respect to the vdlues obtdined for the pure polymer. Introduction Nanosized metal and semiconductor particles possess unique electronic optical and catalytic properties that are different from those of bulk crystals. These properties make them attractive materials for fabricating hybrid composites based on a polymer matrix with nanoparticle fillers 1 allowing tailor-made electrical and optical composite responses. Among nanoscale fillers Co and MgO structured particles are particularly promising candidates as they possess a variety of outstanding physicochemical properties which are utilized in the Fischer-Tropsch catalysis the carbon nanotube synthesis and for hydrogen storage applications. In addition the combination of a magnetic-core and dielectric-shell to form a magnetic material with high permeability at high frequency may play an important role in satisfying the requirements for miniaturization of communication equipments 2 3 . Poly
